fix(ci): stabilize latest-master acceptance gates

.agents/notes/implemented/process/2026-08-08-native-windows-pull-request-ci.md

@@ -18,7 +18,7 @@ Every pull request also starts an ordinary independent `windows-native` job name
 
 The native job is deliberately absent from `all-checks-passed.needs` and does not use `continue-on-error`: the aggregate neither waits for it nor changes conclusion because of it, while the job retains its own unmasked result. Workspace build, production-site, and 100%-per-file coverage failures make the native job fail. The broader static, documentation, package, and built-artifact portability inventory remains observational. Linux remains the owner of duplicate lint and snapshot enforcement, while native Windows independently enforces supported-source coverage.
 
-The 16-core lane gives coverage a two-worker budget, split into one instrumented worker and one exempt-heavy worker, runs two top-level gates concurrently, and allows eight publint workers. Every Vitest project uses forked workers because Node 24's CJS lexer fatal reproduced in shared worker threads on Windows and POSIX; the two-gate schedule prevents the exempt-heavy Oxlint probe from racing the workspace build over its temporary contract files. Both coverage gates set Vitest's default per-test and polling budgets to 15 seconds because unrelated process, Git, SQLite, watcher, grammar, and static-gate fixtures repeatedly needed 8–10 seconds only under the complete lane's concurrent Windows instrumentation. This lane-scoped default preserves explicit fixture budgets and asserted outcomes, while the 60-minute job deadline still bounds a stuck run. The LSP sources and the ACL-sandbox sources remain in the Windows denominator: stub-based failure-path suites carry every in-process ACL-sandbox file to 100%, and only the runner entry stays excluded — it executes exclusively as a spawned child outside the instrumented run, its behavior pinned end-to-end by the runner suite. Narrow annotated V8 ignores cover only unreachable branches (peer-platform arms and lifecycle-unreachable guards), with their behavior tests retained on the owning platform.
+The 16-core lane gives coverage a two-worker budget, split into one instrumented worker and one exempt-heavy worker, runs two top-level gates concurrently, and allows eight publint workers. Every Vitest project uses forked workers because Node 24's CJS lexer fatal reproduced in shared worker threads on Windows and POSIX; the two-gate schedule prevents the exempt-heavy Oxlint probe from racing the workspace build over its temporary contract files. Both coverage gates set Vitest's default per-test and polling budgets to 30 seconds because unrelated process, Git, SQLite, watcher, grammar, and static-gate fixtures can exceed 15 seconds only under the complete lane's concurrent Windows instrumentation. The script-only translation-pairing merge suite runs in the exempt-heavy gate because it imports only `scripts/` sources and child processes; V8 instrumentation contributes no threshold coverage there but magnifies Git-process latency. Lefthook concurrency fixtures retain their outcomes with 30-second case budgets and a 10-second process-ready probe, while the installer allows five seconds for a preempted lock owner to publish its record after exclusive creation. Workspace-context composition fixtures use a test-owned signal without an unrelated one-second deadline. These lane-scoped budgets preserve asserted outcomes, while the 60-minute job deadline still bounds a stuck run. The LSP sources and the ACL-sandbox sources remain in the Windows denominator: stub-based failure-path suites carry every in-process ACL-sandbox file to 100%, and only the runner entry stays excluded — it executes exclusively as a spawned child outside the instrumented run, its behavior pinned end-to-end by the runner suite. Narrow annotated V8 ignores cover only unreachable branches (peer-platform arms and lifecycle-unreachable guards), with their behavior tests retained on the owning platform.
 
 The 16-core allocation is the measured capacity point for this inventory. Relative to the previous two-core serial job, six coverage workers produced complete passes in 6 minutes 27 seconds and 7 minutes 50 seconds, but later exact-head repeats exposed unreliable fixtures and worker exits under four, three, and two concurrent instrumented workers. The selected budget therefore reduces that fan-out to one while retaining the exempt-heavy suite as a second concurrent coverage worker and preserving two-way top-level overlap. A 32-core comparison reduced aggregate gate time by only 1.47 seconds and still triggered the CJS-lexer fatal inside a fork worker, so additional cores did not provide a reliable wall-clock improvement.